Radio loud-speaker



April 23, 1929. A. HERSCHEL RADIO LOUD SPEAKER Filed July 25. 1927Patented Apr. 23, 1929.

UNITED STATES ALFRED HEBSCHEL, OF NEW YORK, N. Y.

RADIO LOUD-SPEAKER.

Application filed July 25,

This invention relates to improvements in radio loud speakers and hasparticular reference to a mounting for sound producing units thereof.

The primary object of the invention resides in a means by which thesound qualities of a loud speaker are improved by reason of thenon-vibratory base on which the armature or flapper is mounted.Heretofore, the vibration of the unit mounting has interfered with thequality of sound produced which prevents reproduction of a natural tone.

Another object of the invention is to provide a mounting for loudspeaker units in which the anchorage for the armature or flapper isembedded in a base of non-sounding metal.

\Vith these and other objects in view, the invention resides in certainnovel construction and combination and arrangement of parts, theessential features of which are.

hereinafter fully described, are particularly pointed out in theappended claims, and are illustrated in the accompanying drawing, inwhich Figure 1 is a front elevation of my improved loud speaker unitmounting.

Figure 2 is a vertical sectional view on the line 22 of Figure 1.

Figure 3 is a similar view on the line of Figure 1.

Figiu'e 4 is a detail vertical sectional view on the line 4+4 of Figure3.

Figure 5 is a detail vertical sectional view of a modified form.

Referring more particularly to the drawing. the reference numeral 10designates a disk or base made of lead having a proportionate amount ofantimony mixed therewith to slightly harden the same. The front face ofthe base has a projecting boss 11 thereon within which an elongatedanchor plate 12 is embedded. A metal collar 13 is also embedded .in theboss and has one end bearing against the anchor plate 12 and its otherend flush with the outer face of the boss. The loud speaker armature orflexible flapper is indicated at 14 and has one of its ends fastened tothe anchor plate by a screw 15 which threads into an opening 16 in theanchor plate 12. The screw also passes through one end of a guide 17which overlies the armature but which has its free end offset as at 18and provided with an opening 19 for the passage of 1927. Serial N0.208,331.

the vibratory pin 20 which has one of its ends fixed to the armature andits other end fixed to the apex of a cone diaphragm 21.

The base casting 10 has an opening 22 therein for register with athreaded opening in the anchor plate and with which the threaded end ofan adjusting screw 24 e0- acts. The screw 24 is adapted to bear againstthe armature 14 to apply pressure thereon for adjusting the range ofmovement of the same for adapting the unit for operation under variousconditions. The guide 17 has a teet 25 thereon for hearing engagementwith the armature at a point opposite the adjusting screw and whichtends to space the major portion of the guide from the armature.

In Figure 5 of the drawing, I have shown a slightly modified form of myinvention, in which the numeral 10 designates a portion of the lead basein which spaced internally threaded sleeves 12 and 12" are embedded, thesame having heads 26 for anchorage purposes. The outer ends of thesleeves lie flush with the front of the base 10 and threadcdly receivethe screws 15 and 24 for the same purpose as set forth in the preferredform.

From the foregoing description, it will be seen that I have provided asimple mounting for the armature of a loud speaker unit, in which theanchorage therefor is embedded in n lead base or other non-soundingmaterial whereby the base is prevented from receiving any of thevibrations from the armature during vibration of the same. Thisstructure prevents any distortion in the sound prodn'ced and which ispresent in loud speakers now in use. This invention assures areproduction of clear and natural tones.

lVhile I have described what I deem to be the most desirable embodimentof my invention, it is obvious that many of the details may be variedwithout in any way departing from the spirit of my invention, and Itherefore do not limit myself to the exact details of constructionherein set forth nor to anything less than the whole of my inventionlimited only by the appended claims.

lVhat is claimed as new is 1. In a loud speaker unithaving an armature.a base of non-sounding metal, and an anchor member embedded in said baseto which said armature is fixedly connected.

2. In a loud speaker unit having an armature, a lead base, an anchormember embedded in said lead base, and a removable element enga-gableWith said anchor member for securing said armature to said base.

3. In a loud speaker unit having an armature, a lead base, an anchormember embedded in said lead base and having a threaded bore therein,and a screw passing through said armature and (Jo-acting with saidthreaded bore for securing said armature against said lead base.

4;, In a loud speaker unit having an armature, a lead base, an elongatedanchor member embedded in said lead base, a screw passing through saidarmature and into said an (:hor member. and an adjusting serrw threadedin said anchor member and ongageable with said armature.

5. In a load speaker unit having an armalinre, a metal base, an anchormember embedded in said base and a removable screw threaded to said basefor securing said armature thereto.

In testimony whereof I hereby ailix my signature.

ALFRED HERSCI-IEL.

